Django's configuration file, add or delete pycharm and django connect to the database, create tables and table change search

table of Contents

　After you create a project file folder configuration
Static configuration file
form Form Review
Depending on the mode of the request, and returns information on the front end
pycharm MYSQL database connection
Django connection configuration database MYSQL
Django's ORM
- What is ORM?
- Database migration command

　After you create a project file folder configuration

When you create a project with pycharm> settings to customize an app name, to help you automatically create an application, and automatically create a template folder, view the configuration INSTALLED_APPS does not automatically add the new app, if not manually add, TEMPLATES list "DIRS" If did not add path templates folder, add it manually.

Log Function
1. Route L (R & lt 'Login ^ /', views.login) , if not access slash slash internal routing automatically redirected

all

2. All front-end browser rendered pages are written in html file back end, these files are written in the default templates folder;

3. All static files (css, js, front-end third-party libraries) are placed in static default folder

html page the way the introduction of external resources
1) CDN
2) Local

Static configuration file

STATIC_URL = '/ static /'
static configuration files, be exposed to the outside world can still access the server folder below all the resources
STATICFILES_DIRS = [
os.path.join (base_dir, 'static')]

STATIC_URL = '/ static /' # interfaces prefix (each html incoming links prefix in the document template folder) with little relation name of your static folders are not, this prefix by default with a static folder name as !
html file template in import JQuery, css, js links to static folder prefix will find the corresponding import file,

Static configuration file
STATICFILES_DIRS = [
os.path.join (base_dir, 'static'), # is your static folder path
os.path.join (base_dir, 'static1'),
os.path.join (base_dir, 'static2 ')]

ps: incoming links within html file prefix will in turn find the list of all the static file path is linked with their match (if there is a path to the file prefix static) to find the words to stop immediately return a 404 not found

form Form Review

form Form trigger action are two ways to submit data

<input type="submit">
<button></button>

orm targeting address data submitted
action filed address attribute control
1. The full path

<form action="http://127.0.0.1:8000/login/",method="post"> # method不写默认是get请求

Into a post request, remember the settings in the configuration file middleware written off. Otherwise newspaper Yellow Pages

2. Write only the path suffix

<form action="/login/">

3. Do not write (default submission to the current path)

The default is to get a request form form

Depending on the mode of the request, and returns information on the front end

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
    <link rel="stylesheet" href="/static/bootstrap-3.3.7/css/bootstrap.min.css">
    <script src="/static/bootstrap-3.3.7/js/bootstrap.min.js"></script>

</head>
<body>

<div class="container">
    <div class="'row">
        <h1 class="text-center">登录页面</h1>
        <div class="col-md-6 col-md-offset-3">
            <form action="" method="post">
                <p>username:<input type="text" class="form-control" name="username"></p>
                <p>username:<input type="text" class="form-control" name="username"></p>
                <p>username:<input type="text" class="form-control" name="username"></p>
                <p>password:<input type="password" class="form-control" name ="password"></p>
                <input type="submit" class="btn btn-success">
            </form>
        </div>
    </div>
</div>
</body>
</html>

根据客户端请求方式的不同执行不同的逻辑代码
from django.shortcuts import render,HttpResponse

# Create your views here.
def login(request):
    # print(request)   # request：<WSGIRequest: GET '/login/'>

    # print(request.method)  # 获取的是用户的请求方式，是全大写的字符串
    if request.method == "POST":
        print(request.POST)  # 你就把它当成一个大字典里面存放了客户端post提交的所有的数据
        # <QueryDict: {'username': ['zhang'], 'password': ['123']}>
        print(request.POST.get('username'))  # value虽然是个列表但是获取value的时候拿到却是单个元素
        # 默认只会取value列表里面的最后一个元素
        # <QueryDict: {'username': ['zhang', 'li', 'zhao'], 'password': ['1234']}>

        # 一次性获取value列表里面所有的数据需要用getlist()
        print(request.POST.getlist('username'))  # ['zhang', 'li', 'zhao']
        print(request.POST['password'])  # 不推荐使用该方法获取数据
        return HttpResponse('登录成功！')

    return render(request,'login.html')
'''
获取value列表里面所有的元素需要使用getlist  应用场景:用户的爱好 多选框get只会获取到value列表的最后一个元素
'''

  # print(request.environ)
    '''
{'ALLUSERSPROFILE': 'C:\\ProgramData',
'APPDATA': 'C:\\Users\\Administrator\\AppData\\Roaming',
'COMMONPROGRAMFILES': 'C:\\Program Files\\Common Files',
'COMMONPROGRAMFILES(X86)': 'C:\\Program Files (x86)\\Common Files',
'COMMONPROGRAMW6432': 'C:\\Program Files\\Common Files',
'COMPUTERNAME': 'WIN-KIJ962UBO3B',
'COMSPEC': 'C:\\windows\\system32\\cmd.exe',
'DJANGO_SETTINGS_MODULE': 'day52.settings',
'FP_NO_HOST_CHECK': 'NO', 
'HOMEDRIVE': 'C:',
'HOMEPATH': '\\Users\\Administrator', 
'LOCALAPPDATA': 'C:\\Users\\Administrator\\AppData\\Local', 
'LOGONSERVER': '\\\\WIN-KIJ962UBO3B',
'NUMBER_OF_PROCESSORS': '4',
'OS': 'Windows_NT', 
'PATH': 'G:\\python36;G:\\python36\\Scripts;G:\\Python27;G:\\Python27\\Scripts;G:\\Python27\\Scripts;G:\\python36\\Scripts;C:\\windows\\system32;C:\\windows;C:\\windows\\System32\\Wbem;C:\\windows\\System32\\WindowsPowerShell\\v1.0\\;C:\\Users\\Administrator\\Desktop\\new 1.py;G:\\sub3;G:\\MYSQL\\bin;G:\\Git\\cmd;G:\\Git\\mingw64\\bin;G:\\Git\\usr\\bin;G:\\python36\\lib\\site-packages\\numpy\\.libs;G:\\python36\\lib\\site-packages\\numpy\\.libs', 'PATHEXT': '.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC', 'PROCESSOR_ARCHITECTURE': 'AMD64', 'PROCESSOR_IDENTIFIER': 'Intel64 Family 6 Model 69 Stepping 1, GenuineIntel',
'PROCESSOR_LEVEL': '6',
'PROCESSOR_REVISION': '4501',
'PROGRAMDATA': 'C:\\ProgramData',
'PROGRAMFILES': 'C:\\Program Files',
'PROGRAMFILES(X86)': 'C:\\Program Files (x86)',
'PROGRAMW6432': 'C:\\Program Files', 
'PSMODULEPATH': 'C:\\windows\\system32\\WindowsPowerShell\\v1.0\\Modules\\',
'PUBLIC': 'C:\\Users\\Public',
'PYCHARM_HOSTED': '1',
'PYCHARM_MATPLOTLIB_PORT': '49203',
'PYTHONIOENCODING': 'UTF-8', 
'PYTHONPATH': 'G:\\PyCharm 2018.1.4\\helpers\\pycharm_matplotlib_backend;G:\\Python代码日常\\day52'
'PYTHONUNBUFFERED': '1',
'SESSIONNAME': 'Console',
'SYSTEMDRIVE': 'C:', 
'SYSTEMROOT': 'C:\\windows',
'TEMP': 'C:\\Users\\ADMINI~1\\AppData\\Local\\Temp',
'TMP': 'C:\\Users\\ADMINI~1\\AppData\\Local\\Temp',
'USERDOMAIN': 'WIN-KIJ962UBO3B',
'USERNAME': 'Administrator',
'USERPROFILE': 'C:\\Users\\Administrator',
'WINDIR': 'C:\\windows',
'WINDOWS_TRACING_FLAGS': '3',
'WINDOWS_TRACING_LOGFILE': 'C:\\BVTBin\\Tests\\installpackage\\csilogfile.log',
'RUN_MAIN': 'true',
'SERVER_NAME': 'WIN-KIJ962UBO3B', 
'GATEWAY_INTERFACE': 'CGI/1.1',
'SERVER_PORT': '8000', 
'REMOTE_HOST': '', 
'CONTENT_LENGTH': '', 
'SCRIPT_NAME': '', 
'SERVER_PROTOCOL': 'HTTP/1.1',
'SERVER_SOFTWARE': 'WSGIServer/0.2',
'REQUEST_METHOD': 'GET', 
'PATH_INFO': '/login/', 
'QUERY_STRING': '',
'REMOTE_ADDR': '127.0.0.1',
'CONTENT_TYPE': 'text/plain',
'HTTP_HOST': '127.0.0.1:8000', 
'HTTP_CONNECTION': 'keep-alive', 
'HTTP_UPGRADE_INSECURE_REQUESTS': '1',
'HTTP_USER_AGENT': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36',
'HTTP_ACCEPT': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3',
'HTTP_ACCEPT_ENCODING': 'gzip, deflate,
br', 'HTTP_ACCEPT_LANGUAGE': 'zh-CN,zh;q=0.9,en;q=0.8',
'HTTP_COOKIE': 'csrftoken=YN8zgrVrZ4rrIZpWwFmyKY6yp2ggTCaUsDT4HJYUn36OY7Ijk7LpGTHtKbNML8EB',
'wsgi.input': <_io.BufferedReader name=656>,
'wsgi.errors': <_io.TextIOWrapper name='<stderr>' mode='w' encoding='UTF-8'>,
'wsgi.version': (1, 0), 'wsgi.run_once': False,
'wsgi.url_scheme': 'http',
'wsgi.multithread': True, 
'wsgi.multiprocess': False,
'wsgi.file_wrapper': <class 'wsgiref.util.FileWrapper'>}
    '''

pycharm MYSQL database connection

Directly on the map:

Can be achieved with the data in the database is updated simultaneously deleted;

Django connection configuration database MYSQL

settings>DATABASES

DATABASES = {    'default': {        'ENGINE': 'django.db.backends.sqlite3',        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),    }}

    django连接数据库
    1.需要修改配置文件
    
# 修改为：
        DATABASES = {
            'default': {
                'ENGINE': 'django.db.backends.mysql',
                'NAME': 'day54',
                'HOST':'127.0.0.1',
                'PORT':3306,
                'USER':'root',
                'PASSWORD':'123'
            }
        }
        ps:键必须都是大写
            
2.告诉django用pymysql替换它默认mysqldb模块连接数据库
        方式1:在你的项目文件夹下面的__init__.py
        方式2:也可以在你的应用文件夹下面的__init__.py
        
        # 固定写法
        import pymysql
        pymysql.install_as_MySQLdb()  # 告诉django用pymysql代替mysqldb连接数据库

Django's ORM

What is ORM?

Relational Mapping Object
Class "" "Table
" "object" table record
attribute "object", "a field value corresponding to a record

The django orm can not automatically help you create a library, but can help you automatically create a table
Tip: a django project on the use of a library, do not use a multiple django project library

from django.db import models

# Create your models here.
class User(models.Model):
    id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=32)
    password = models.CharField(max_length=16)

Database migration command

The following command cmd terminal knock

# 数据库迁移(同步)命令(******)
python3 manage.py makemigrations  # 将你的数据库变动记录到一个小本本上(并不会帮你创建表)
python3 manage.py migrate         # 将你的数据库变动正在同步到数据库中